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This use counter measures calls to the detect() methods provided by the
BarcodeDetector, FaceDetector and TextDetector classes. This is needed
by the Origin Trial infrastructure so that we can measure use of this
API in general rather than use of each detector type individually (which
is covered by the existing use counters).

Bug: 646035
Change-Id: Ic4c70b7e282b0569fad50f273aa9754b0bcb9bbf
Reviewed-on: https://chromium-review.googlesource.com/1161285Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Jason Chase <chasej@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580548}